02:08AM | 04/19/06
Member Since: 04/18/06
1 lifetime posts
Help please I am installing a 18x20 carport and need to know how to square the foundation for it.

Thanks to all for your advice


doug seibert

02:46AM | 04/19/06
Member Since: 08/10/02
843 lifetime posts
Generally you SQUARE one corner of the carport foundation.....then determine the length and width of the structure and square a second corner and third corner.........The 6-8-10 rule is a basic math "rule"'s a link (to a 1900's book on the subject).....

The two diagonal measurements should then be equal.......(about 26.9 feet).....if not adjust the stringlines.......

Glenn Good

05:06PM | 05/14/06
Member Since: 09/10/03
314 lifetime posts
The best way to square any foundation is to first lay it out roughly (use a framing square or the 6-8-10 rule). Then pull diagonal measurements between cross corners. When the parallel walls measure the same, and the measurements between both sets of opposing corners match, the foundation is perfectly square.

Moderator: Construction Systems, Foundations, and Masonry & Stone

For more information about me, my qualifications, and/or home inspections please visit my website at:

Glenn Good

05:14PM | 05/14/06
Member Since: 09/10/03
314 lifetime posts
Please note the only thing that I added to Doug’s post above is the parallel walls must also be checked to insure they measure the same when making any corrections to square the building. A trapezoid will also have identical diagonal measurements.

Moderator: Construction Systems, Foundations, and Masonry & Stone

For more information about me, my qualifications, and/or home inspections please visit my website at:


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